If you legitimately purchased Camera Control Pro 2 in the past, do not despair. Try these steps before searching risky websites:

It sounds like you’re trying to get Nikon Camera Control Pro 2 up and running! Whether you’ve lost your original key or are looking to manage your license, here is the essential information regarding serial numbers for this software. Where to Find Your Serial Number

The location of your serial number depends on how you originally acquired the software:

To use Nikon Camera Control Pro 2, you'll need a valid serial number. Here are the steps to obtain one: